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Mitigation of post-flutter oscillations in suspension bridges by hysteretic tuned mass dampers
Highlights Flutter of suspension bridges via continuum model with nonlinear aerodynamics. Arrays of hysteretic tuned mass dampers (TMD) optimized for multimode flutter control. Hysteretic TMDs reduce considerably the amplitude of limit cycle oscillations. Optimization penalizes the peak oscillation amplitude and maximizes the decay rate.
Abstract Systems of hysteretic tuned mass dampers are proposed for multi-mode flutter mitigation in long-span suspension bridges. The performance of the nonlinear absorbers is systematically compared with that of classical damped (linearly viscoelastic) absorbers. The equations of motion ensuing from a linearized parametric structural model of a suspension bridge are coupled with the equations governing the dynamics of the passive nonlinear control system and the time-dependent aerodynamic loads obtained through a quasi-steady nonlinear formulation and the unsteady indicial theory. The equations of the controlled aeroelastic system are reduced employing the Faedo-Galerkin method. Numerical simulations are performed to investigate the effectiveness of the vibration absorbers system comparing both the onset of flutter and the post-flutter behavior without the control devices with the corresponding responses obtained when multiple absorbers are installed.
Mitigation of post-flutter oscillations in suspension bridges by hysteretic tuned mass dampers
Highlights Flutter of suspension bridges via continuum model with nonlinear aerodynamics. Arrays of hysteretic tuned mass dampers (TMD) optimized for multimode flutter control. Hysteretic TMDs reduce considerably the amplitude of limit cycle oscillations. Optimization penalizes the peak oscillation amplitude and maximizes the decay rate.
Abstract Systems of hysteretic tuned mass dampers are proposed for multi-mode flutter mitigation in long-span suspension bridges. The performance of the nonlinear absorbers is systematically compared with that of classical damped (linearly viscoelastic) absorbers. The equations of motion ensuing from a linearized parametric structural model of a suspension bridge are coupled with the equations governing the dynamics of the passive nonlinear control system and the time-dependent aerodynamic loads obtained through a quasi-steady nonlinear formulation and the unsteady indicial theory. The equations of the controlled aeroelastic system are reduced employing the Faedo-Galerkin method. Numerical simulations are performed to investigate the effectiveness of the vibration absorbers system comparing both the onset of flutter and the post-flutter behavior without the control devices with the corresponding responses obtained when multiple absorbers are installed.
Mitigation of post-flutter oscillations in suspension bridges by hysteretic tuned mass dampers
Casalotti, A. (author) / Arena, A. (author) / Lacarbonara, W. (author)
Engineering Structures ; 69 ; 62-71
2014-03-03
10 pages
Article (Journal)
Electronic Resource
English
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